We spent a day flight testing our aircraft about 2 weeks before the final event where we competed, won, and broke the world record. We still hold the world record as of 12/2019. This is some footage from that day. This was super risky. If we broke the fragile ~80lb plane made from mostly foam, mylar and a little wood and aluminum we probably wouldn't have had time to fix it before the event. Red Bull had some very strict rules about that heavily constrained the design of this thing, mostly about the overall size and pilot interaction.
Here's a good video of us winning the event:
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